[ICOM] 756 ProII Temp Problem

Bill Archer bfarcher at comcast.net
Wed Sep 22 09:08:28 EDT 2004


As the proud owner of both a 706MkIIG and a ProII I have been following the
discussion on cooling the ProII during extend RX periods.

The 706 has a similar problem in that the case temp would get VERY warm
while in RX. A simple fan mod whereby a 200 ohm 1 Watt resister was place
between a +12v source and the + lead on the cooling fan. This causes the
cooling fan to run at a low speed with about 4.7V applied to the fan. The
effect of this mod is the case temp is reduced by  about 30° F.

It would seem to me that a similar approach could be taken with the ProII to
apply a reduced voltage to the cooling fan to achieve the same results.

Since this reflector is blessed with an abundance of talented and
knowledgeable techno-wizards
would any of you care to comment on this approach?

KC5GNB
Bill in Plano




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